ruc, hrw, mode-s, oplace, etc – lace's da …high resolution winds amv eumetsat nwcsaf is to...

RUC, HRW, Mode-S, OPLACE, etc – LACE's DA systems

Mate Mile and many others

Outline

LACE 1h RUC Kick-off meeting HRW AMV Mode-S in LACE OPLACE

LACE 1h RUC Kick-off meeting

A Kick-off meeting has been organized in order to identify relevant issues, challenges of DA system based on hourly updated analysis cycle.

The goal is to provide reliable frequently updated short-range NWP forecasts focusing on parameters wind-gust, precipitation, temperature, low-level cloudiness and visibility with the highest priority.

The key issues and challenges have been discussed during the meeting together with HIRLAM and Meteo-France colleagues as well.


Observation pre-processing: There is a need to speed up current OPLACE

system for hourly updated analyses! COPE?

Roughly 1 hour is the currentlimit to get conventionalobservations inside C+I


Extension of observational set:

From Benedikt Strajnar, ARSO Slovenia

Sufficient observation constraint is needed in every 1h RUC analyses otherwise DA is going to be failed

High frequency observations become more important

RADAR, GNSS, Mode-S, Meteosat products


Control noise accumulation:

From P. Benacek, CHMI Czech Rep.

In order to reduce spurious numerical noises and imbalances at initial time accurate initial conditions are needed.

Space-consistent coupling and mesoscale EDA structure functions are beneficial.

The need of further initialization e.g. with DFI will be investigated.


Remember other challenges to be tackled Collaboration is more than welcome If You are interested, more information can be

found on LACE webpage (DA page → Workshop & Meetings)

Outline


High Resolution Winds AMV

EUMETSAT NWCSAF is to provide, develop and maintain software packages to be used with operational meteorological satellite data for Nowcasting and Very short range forecasting purposes.

NWCSAF package v2013 contains advanced retrieval algorithm of AMV so called HRW (High Resolution Winds) using Meteosat images.

Through its configuration file, the retrieval options can be tuned easily due to the user (NWC or NWP) requirements.


HRW AMV BUFR output format is defined similarly as EUMETSAT MPEF (Geowind) AMV

HRW algorithm computes the AMVs by default without the use of wind guess in the definition of tracking area.

Advanced CCC height assignment method is also included.

Available on OPLACE


The number of HRW and Geowind AMVs have been determined over a relatively small domain and on a 10 days period. Method105(WV062) Method301(IR108)

HRW provides increased number of AMVs and usually more with higher QIs


Observation monitoring: GEOqi70 – using MPEF AMV above 70%

HRWqi70 – using HRW AMV above 70%

HRWqi80 - using HRW AMV above 80%

HRWqi90 - using HRW AMV above 90%

The bigger part of the HRW is retrieved around 300 – 400 hPa

OMG statistics are similar or better compared to Geowind


Due to preliminary experiments, neutral impact was obtained with HRW assimilation on traditional scores

Improvement can be seen on convective and heavy precipitation case studies (especially on the distribution of precip. objects)

AROME 6h accum. precipitation forecast at 6th of August 2014.

OPER MPEF AMV RADAR HRW AMV

Outline


Mode-S in LACE

In Slovenia, Mode-S MRAR is operationally assimilated since last June.

MRAR has similar quality than AMDAR and therefore used as obstype number 2 during data assimilation.

Quality control is very important (whitelist approach)

Mode-S network is growing inside LACE, recently reports are collected from 4 RADARs (2 from Slovenian, 1 from Czech Rep. and 1 from Austria)


Mode-S in LACE

Reminder:


name MODE-S MRARMeteorological routine air report

MODE-S EHSEnhanced surveilance (reports)

data (BDS 4,4) – met. routine air report wind speed, direction, temperature turbulence, humidity

(BDS 4,5) – met. hazard report (turbulence, wind shear,microburst,icing)

(BDS 4,0) selected vertical intent ( selected altitude)

(BDS 5,0) track and turn report - roll angle, true track angle and rate, ground speed and true air speed

(BDS 6,0) heading and speed report indicated air speed and mach, barometric altitude rate, magnetic heading

type Direct data Indirect (temperature) data

rep. by around 5 % of all Mode-S equipped aircraft (depends on transponder configuration)

all Mode-S equipped aircraft

Strajnar 2012, Hrastovec and Solina 2013 de Hann 2011, de Haan and Stoffelen 2012

Mode-S in LACE

Mode-S MRAR has good and clear impact on winter period (especially for inversions)

During summer period Mode-S is also able to improve wind and precip. forecasts

More details:

Strajnar et. al., 2015 Impact of new aircraft observations Mode-S MRAR in a mesoscale NWP model


WithMode-S

WithoutMode-S

RADAR

Mode-S in LACE

In Slovenian ALARO DA system, humidity is mostly corrected through multivariate link of balance operator (lack of humidity obs)

During summer period this link was found to be sensitive to forecast performance which has to be further studied


univariate

multivariate

Outline


OPLACE BUFR migration issues

Migration from TAC to TDCF has been tackled to provide reliable and up-to-date observations to OPLACE users.

Regarding BUFR SYNOP observations, quality of the reports was found to be correct and BUFR reports are considered as primary source of SYNOPs. TAC SYNOP reports are still handled secondarily.

Regarding BUFR TEMP, quality issues were identified due to encoding mistakes (and similar information was also received through EUMETNET EUCOS based on global center's and ECMWF experiences). Therefore BUFR TEMP reports are experimentally implemented to OPLACE until the quality of the data stabilizes.

WIGOS AMDAR BUFR migration has been also tackled and fixed at the beginning of 2015 in OPLACE.

As a next step BUFR reports are going to be available for OPLACE users beside OBSOUL(ASCII) format.

From Alena Trojakova, LACE DM

Thank You for your attention!

Thank You for colleagues who contributed!

Questions?

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